dissolved oxygen meter
DISSOLVED
OXYGEN METER
Model : YK-22DO
ATTENTION :
Fill the Probe's Electrolyte at first.
Intend to keep the DO probe under
the best condition, when user receive
the DIGITAL OXYGEN METER along
the PROBE, it should fill the Probe's
Electrolyte at first.
Probe-filling Electrolyte
Probe head with Diaphragm set
The procedures that to fill the Probe's
Electrolyte, refer the chapter 9
" PROBE MAINTENANCE ", page 10.
TABLE OF CONTENTS
1. GENERAL DESCRIPTIONS..................................... 1
2. FEATURES............................................................1
3. SPECIFICATIONS..................................................2
3-1 General Specifications.....................................2
3-2 Electrical Specifications................................... 3
4. FRONT PANEL DESCRIPTION................................ 4
5. MEASURING PROCEDURE..................................... 5
5-1 DO Calibration................................................5
5-2 Dissolved Oxygen ( DO ) measurement ...........6
5-3 Oxygen in Air( O2 ) measurement....................6
5-4 Temperature measurement ............................ 6
5-5 Other functions ( Hold, Memory ) ................... 6
6. AUTO POWER OFF DISABLE..................................7
7. RS232 PC SERIAL INTERFACE............................... 8
8. BATTERY REPLACEMENT.......................................9
9. PROBE MAINTENANCE .........................................10
10. OPTIONAL ACCESSORIES................................... 12
1. GENERAL DESCRIPTIONS
* This Digital Oxygen Meter is supplied with a
polarographic type probe with an incorporated
Temp. sensor which serves for precision Dissolved
Oxygen ( DO ), Temp. measurement.
* Applications for Aquarium, Medical research,
Agriculture, Fish hatcheries, Laboratory, Water
conditioning, Mining industry, Schools & Colleges,
Quality control...
2. FEATURES
* The polarographic type oxygen probe with an
incorporated Temp. sensor, high precision
measurement for Dissolved Oxygen ( DO ) and
Temperature measurement.
* DO measurement, automatic Temp. compensation
from 0 to 50 ℃ for sensor.
* Multi-display, show oxygen & Temp. at the same
time.
* Temperature function with ℃ & ℉ display unit.
* Microprocessor circuit, intelligent function.
* Memorize maximum and minimum readings with
recall.
* Data hold.
* Auto power off saves battery life.
* RS 232 PC serial interface.
1
3. SPECIFICATIONS
3-1 General specifications
Circuit
Display
Measurement
DO Sensor
Structure
DO Probe
Temperature
Compensation
Memory
Recall
Data hold
Memory
Recall
Power off
Data Output
Overload
indication
Operating
Temperature
Operating
Humidity
Sampling Time
Power Supply
Microprocessor LSI circuit.
51 mm x 32 mm, dual function LCD display,
15 mm ( 0.6" ) digit size.
* Dissolved Oxygen
* Temperature
The polarographic type oxygen probe with
an incorporated temperature sensor.
0 to 50 ℃,
Automatic.
Memorize maximum and minimum readings
with recall.
Hold the current reading value on the display.
Maximum and minimum reading values can
be saved and retrieved by record function.
Auto power off saves battery life, or manual
off by push button.
RS 232 computer serial interface.
"- - - -" symbol on the display.
0 to 50 ℃
Max. 80% RH.
Approx. 0.8 second.
006P DC 9V battery
( Alkaline or Heavy duty type ).
Power Current Approx. DC 7.0 mA.
Weight
210 g/0.46 LB ( meter only ).
450 g/0.99 LB ( meter and DO probe ).
2
Size
Accessories
included
Optional
Accessories
Main meter :
195 x 68 x 30 mm ( 7.6 x 2.6 x 1.2 inch ).
Oxygen probe :
190 mm x 28 mm Dia.(7.5" x 1.1" Dia.)
* Cable length : 4 meters.
Oxygen probe ( OXPB-22 )................ 1 PC.
Operation manual............................. 1 PC.
Spare Probe head with Diaphragm
OXHD-04..........................................2 set
Probe-filling Electrolyte
OXEL-03...........................................1 set
Carrying case, CA-06.........................1 PC.
* Oxygen probe.......................OXPB-22
* Spare Probe head with Diaphragm set
............................................OXHD-04
* Probe-filling Electrolyte..........OXEL-03
* RS232 cable..........................UPCB-02
* USB cable.............................USB-01
* Data Acquisition software
............................................SW-U801-WIN
3-2. Electrical Specifications
Dissolved Oxygen
Range
Resolution
Accuracy
0 to 20.0 mg/L ( liter ).
0.1 mg/L.
± 0.4 mg/L.
@ 23 5 ℃
Temperature
Range
Accuracy
@ 23 5 ℃
Resolution
℃.
℉.
℃.
℉.
℃:
0 to 50 ℃.
32 to 122 ℉.
± 0.8 ℃
± '1.5 ℉.
0.1 ℃, ℉ : 0.1 ℉.
3
4. FRONT PANEL DESCRIPTION
Fig. 1
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
Display
Power Button
REC. Button
Hold Button
℃/℉ button
O2, mg/L Button
ZERO Button
CAL Button
Battery Compartment/
Cover
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4
Lock Switch
Probe Input Socket
RS-232 Out Terminal
Stand
Oxygen Probe
Probe Plug
Probe Protection Cover
Temperature sensor
Probe head with diaphragm set
5. MEASURING PROCEDURE
5-1 Calibration
Before the measurement, it should make following
calibration procedures first :
1) Connect the " Probe Plug " ( 4-15, Fig. 1 )
into the " Probe Input Socket " ( 4-11, Fig. 1 )
Make sure that the " Lock Switch " ( 4-10, Fig. 1 )
is in the lock position (
).
2) Power on the instrument by pushing the " Power Button "
( 4-2, Fig. 1 ).
3) Push the " O2 mg/L Button " ( 4-6, Fig. 1 ) to select the
" % O2 " function, the display will show the symbol of
" % O2 "
4) Push the " Zero Button " ( 4-7, Fig. 1 ) once, the LCD
will show zero value and then display the " Air Oxygen "
value.
5) Wait approx. 5 minutes at least until the display reading
values become stable & no fluctuation.
Push the " CAL Button " ( 4-8, Fig. 1 ) then the
display will show the values exact same as 20.9 or
20.8. (As the oxygen in air is 20.9 % typically, so
use this data for quick & precise calibration).
Consideration :
Please make calibration procedures under wide
and ventilating environment for best effect.
5
5-2 Dissolved Oxygen ( DO ) measurement
1) After the meter be calibrated ( above procedure 5-1 ),
now the meter is ready for Dissolved Oxygen ( DO )
measurement.
2) Push the " O2, mg/L Button " ( 4-6, Fig. 1 ) to select the
" DO " function, the display will show the symbol of
" mg/L " .
5-3 Oxygen in Air ( O2) measurement
1) After the meter be calibrated ( above procedure 5-1 ),
now the meter is ready for O2 measurement.
2) Push the " O2 mg/L Button ( B Button ) " ( 4-6, Fig. 1 )
to select the " % O2" function, the display will show the
symbol of " % O2 "
3) The display will show the air oxygen in % values for
reference.
5-4 Temperature measurement
During the measurement, the lower LCD Display will
show the temperature values of measuring solution.
Push the " ℃/℉ Button " ( 4-5, Fig. 1 ) once will change
the temperature display unit from " ℃ to ℉ "
or " ℉ to ℃ ".
5-5 Other functions ( Hold, Memory )
Data Hold
Press the " Hold Button " ( 4-4, Fig. 1 ) will hold the
measured value & the LCD will indicate a " HOLD " symbol
on the display during the measuring.
* Press the " Hold Button " again to exit the data hold
function.
6
Data Record ( Max., Min. reading )
* The data record function records the maximum and
minimum readings. Press the " REC. Button " ( 4-3, Fig. 1 )
to start the Data Record function and there will be a
" REC " symbol on the display.
* With the " REC " symbol on the display :
a) Press the " REC. Button " ( 4-3, Fig. 1 ) once, the
" REC Max " symbol along with the maximum value
will appear on the display.
If intend to delete the maximum value, just press
the " Hold Button " ( 4-4, Fig. 1 ) for a while, and then
the display will show the " REC " symbol only &
execute the memory function continuously.
b) Press the " REC. Button " ( 4-3, Fig. 1 ) again, the
" REC Min " symbol along with the minimum value
will appear on the display.
If intend to delete the minimum value, just press
the " Hold Button " ( 4-4, Fig. 1 ) for a while, and then
the display will show the " REC " symbol only &
execute the memory function continuously.
c) To exit the memory record function, just press the
" REC " button for 2 seconds at least. The display will
revert to the current reading.
6. AUTO POWER OFF DISABLE
The instrument has " Auto Power Off " function in
order to prolong battery life. The meter will shut
off automatically if none of the buttons are pressed
in approx. 10 min.
7
To disable this function, Select the memory record
function during the measurement by pressing the
" REC. Button " ( 4-3, Fig. 1 ).
7. RS232 PC SERIAL INTERFACE
The instrument features RS232 output via 3.5 mm Terminal
( 4-12, Fig. 1 ).
The signal output is a 16 digits data stream which
can be utilized for user's specific application.
A RS232 lead with the following connection will
be required to link the instrument with the PC
serial interface.
Meter
(3.5 mm jack plug)
PC
(9W 'D" Connector)
Center Pin........................................ Pin 4
Ground/shield......................................Pin 2
Pin 5
2.2 K
resistor
The 16 digits data stream will be displayed in the
following format :
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
8
Each digit indicates the following status :
D15
D14
D13
D8 to D1
Start Word
4
When send the upper display data = 1
When send the lower display data = 2
Annunciator for Display
℃ = 01
℉ = 02
O2= 06
mg/L = 07
Polarity
0 = Positive
1 = Negative
Decimal Point(DP), position from right to the left
0 = No DP, 1= 1 DP, 2 = 2 DP, 3 = 3 DP
Display reading, D8 = MSD, D1 = LSD
D0
End Word
D12, D11
D10
D9
For example :
If the display reading is 1234, then D8 to D1 is :
00001234
RS232 setting
Baud rate
Parity
Data bit no.
Stop bit
9600
No parity
8 Data bits
1 Stop bit
8. BATTERY REPLACEMENT
1) When the left corner of LCD display show "
",
it is necessary to replace the battery. However, in-spec.
measurement may still be made for several hours after
low battery indicator appears.
2) Slide the " Battery Cover " ( 4-9, Fig. 1 ) away from the
instrument and remove the battery.
3) Replace with 9V battery ( Alkaline or Heavy duty type )
and reinstate the cover.
4) Make sure the battery cover is secured after changing the
battery.
9
9. PROBE MAINTENANCE
First time to use the meter :
Intend to let the DO probe keep the best
condition, when user receive the DIGITAL
OXYGEN METER along the PROBE, it should
fill the Probe's Electrolyte at first.
Already use the meter for a certain period :
Whenever user can not calibrate the meter
properly or the meter's reading value is not stable,
please check the oxygen probe to see if the
electrolyte in the probe head container is run out
or the diaphragm ( probe head with diaphragm
set) exist problem ( dirty ). If yes, please fill the
electrolyte or change the " Probe head with
diaphragm set " and make the new calibration
( refer chapter 5-1, page 5 ).
The consideration of Diaphragm ( probe head
with diaphragm set) :
The oxygen probe component is the thin Teflon
diaphragm housed in the tip of the probe. The
diaphragm is permeable by the oxygen molecules but
not by the considerably larger molecules contained in
the electrolyte. Due to this characteristic, the oxygen
may diffuse throughout the electrolyte solution
contained in the probe, and its concentration may be
quantified by the measurement circuit.
10
This sensitive diaphragm is rather delicate & is easily
damaged if it comes into contact with solid objects or is
subjected to blows. If the diaphragm is damaged ( dirty ) or
the electrolyte is run out, it must be replaced in the
following way :
Probe-filling Electrolyte,
OXEL-03
Probe head with Diaphragm set
1) Unscrew the " Probe head " ( 9-3, Fig 2 ).
2) Pour out the old Electrolyte from the
container of the " Probe head ".
If the diaphragm is damaged ( dirty ),
then change the new " Probe head with
diaphragm set ".
3) Fill the new Electrolyte ( OXEL-03 )
into the container of the " Probe
head " .
4) Screw the " Probe head " ( 9-3, Fig 2 )
into the probe body.
Fig. 2
9-1 Probe handle
9-2 Temp. sensor
9-3 Probe head with diaphragm set
11
10. OPTIONAL ACCESSORIES
SPARE DIAPHRAGM
Model : OXHD-04
PROBE FILLING
ELECTROLYTE
Model : OXEL-03
OXYGEN PROBE
Model : OXPB-22
RS232 cable
Model : UPCB-02
USB cable
Model : USB-01
SOFTWARE
Model:
SW-U801-WIN
Spare Probe head with Diaphragm set.
each package with 2 sets.
Electrolyte for dissolved oxygen
meter probe.
Exclusive oxygen probe for YK-22DO
Interface cable for connecting between
the meter & the computer( COM port ).
Interface cable for connecting between
the meter & the computer( USB port ).
Windows version application software
applies as the performance of data
logging system & data recorder...
12
0604-YK22DO
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